5. Why Do Molecules Move Without Being Pushed?
Aug 24, 2026·
·
1 min read
Xander Chu
Key Question
Why do molecules move without being pushed?
What You’ll Learn
- Why particles are constantly moving
- How thermal energy relates to molecular motion
- Why molecules collide randomly
- How random movement produces diffusion
- Why this matters inside living systems
Key Takeaway
Molecules do not need a biological force to keep them moving.
At ordinary temperatures, particles already have thermal energy and are constantly moving and colliding.
Next
Continue to Why Doesn’t Everything Just Mix Together?
Authors
Xander Chu
(they/them)
Founder, XC Psych
Psychology student at UNSW exploring psychology and neurobiology from first principles, with a background in data science, machine learning, software engineering, and tennis coaching.